I have been listening to the first part of a two part BBC World Service series, Policing the Poppy Fields. It mentioned in passing that Helmand province in Afghanistan produces half of the world’s opium. The number of specialist anti-drug police there? 32. And most disturbing – Afghan production has greatly exceeded global demand for some years. As a result even if the country stopped producing opium entirely there are stockpiles (somewhere) of around 3000 tonnes of the stuff…